You'd think Lion, or maybe Lynx (but that still sounds a bit too much like Linux to me). But by that logic, Tiger may have waited until 10.7 or 8. Cheetah wouldn't have been 10.0 (except for irony's sake). So I'm sure they'll come out with something we haven't even thought about yet. Just as I'm sure that just because they have the names, it doesn't mean they'll use all of them. The could jump from .5 or .6 to something else entirely.
And poundsmack, even though you got censored, I have a feeling I know what that 5 letter word was supposed to be.